Do I understand correctly from the "requirements" page that you have to separately install phpbb into the website root first, and after that you then install the Joomla component?

OR, does p8pBB bridge install phpbb as part of the component installation? (The example I am thinking of is a bridge for OpenCart called JooCart, which installs the OpenCart store software along with the Joomla bridge for it, as one big component.)